/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package servlets;

import database.DBAccess;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 */
@WebServlet(name = "AddtoBasket", urlPatterns = {"/AddtoBasket"})
public class AddtoBasket extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String isbn = request.getParameter("isbn");
        HttpSession session = request.getSession(true);
        System.out.println("access");
        if (session.getAttribute("basket") == null) {

            out.println("empty");
            ArrayList<String> nbasket = new ArrayList<String>();
            nbasket.add(isbn);
            session.setAttribute("basket", nbasket);
        } else if(session.getAttribute("basket")!=null&&request.getParameter("remove")==null){
            
            ArrayList<String> basket = (ArrayList<String>) session.getAttribute("basket");
            if (isbn != null && isbn.trim().length() > 0) {
                try {
                    DBAccess dba = DBAccess.getInstance();
                    if (dba.checkISBN(isbn)) {
                        basket.add(isbn);
                        out.println("true");
                        System.out.println(basket.size());
                        session.setAttribute("basket", basket);
                    } else {
                        response.setStatus(400);
                    }
                } catch (ClassNotFoundException ex) {
                    response.setStatus(400);
                    Logger.getLogger(AddtoBasket.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        else if(session.getAttribute("basket")!=null&&request.getParameter("remove")!=null&&request.getParameter("isbn")!=null)
        {
              ArrayList<String> basket = (ArrayList<String>) session.getAttribute("basket");
            boolean remove = basket.remove(request.getParameter("isbn").toString());
               session.setAttribute("basket", basket);
              if(remove==false)
                    response.setStatus(400);
        }
        else
              response.setStatus(400);
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
